Bosch Rexroth | ZDR-6-DP0-4540YM
ZDR 6 DP0-45/40YM
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The ZDR 6 DP0-45/40YM pressure reducing valve belongs to the ZDR Pressure Reducing Valves series and is built by Bosch Rexroth for hydraulic automation requiring controlled branch pressure. It is direct operated so the spool is actuated directly by system pressure without a pilot stage, which shortens response time. Pressure reduction takes place in channel P, letting the primary supply feed the secondary circuit through this path. The valve mounts as a sandwich plate so it can be stacked between subplate and directional valves in compact manifolds. Its porting pattern follows ISO 4401-03-02-0-05, ensuring interface compatibility with size 6 mounting surfaces. Pilot oil is supplied internally which eliminates an external feed line, and the return is external through port T(Y) to keep pilot flow separate from the main exhaust. There is no check valve, reducing internal pressure loss. The unit weighs 1.2 kg, limiting load on the manifold.
The valve works with an input pressure up to 350 bar so it can be installed in high-pressure systems, while the secondary side is limited to 315 bar to protect downstream actuators. It supports a maximum flow of 50 l/min which suits moderate capacity circuits, and it tolerates counter pressure at port T(Y) up to 160 bar so return line back-pressure will not disturb regulation. A dedicated pressure gauge port is present, giving maintenance personnel a fixed location for pressure verification. The cleanliness requirement of ISO 4406 class 20/18/15 defines the permissible contamination level to maintain functional reliability. All dynamic seals are NBR, providing compatibility with common hydraulic oils. These features complete the specification set and define the operating limits of the ZDR 6 DP0-45/40YM in automated hydraulic machinery.
Technical Specifications
Actuation Type
Direct Operated
Check Valve
None (M)
Cleanliness Class
ISO 4406 20/18/15
Max Counter Pressure Port T(y)
160 bar
Max Flow
50 l/min
Max Operating Pressure (input)
350 bar
Max Secondary Pressure (output)
315 bar
Mounting Type
Sandwich Plate
Nominal Size
6
Pilot Oil Return
External (T(Y))
Pilot Oil Supply
Internal
Porting Pattern
ISO 4401-03-02-0-05
Pressure Gauge Port
Present
Reduction Channel
P
Seal Material
NBR
Weight
1.2 kg
1620 Old Apex Road
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